<template>
  <div class="upload-file">
    <el-upload
      :action="uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :on-error="handleUploadError"
      :on-success="handleUploadSuccess"
      multiple
      :on-change="handleChange"
      :show-file-list="false"
      :headers="headers"
      class="upload-file-uploader"
      name="uploadfile"
      :auto-upload="false"
      v-if="disable"
      accept=".cdr,.pdf,.ppt,.ai"
      ref="fileUpload"
    >
      <!-- 上传按钮 -->
      <el-button slot="trigger" size="mini" type="primary">选取文件</el-button>
      <el-button
        style="margin-left: 10px"
        size="small"
        type="success"
        @click="submitUpload"
        >上传文件</el-button
      >
      <!-- 上传提示 -->
      <div class="el-upload__tip" slot="tip" v-if="showTip">
        请上传
        <template v-if="fileSize">
          大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
        </template>
        <template v-if="fileType">
          格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
        的文件
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group
      class="upload-file-list el-upload-list el-upload-list--text"
      name="el-fade-in-linear"
      tag="ul"
    >
      <li
        :key="index"
        class="el-upload-list__item ele-upload-list__item-content"
        v-for="(file, index) in fileList"
        @mouseenter="uid = file.uid"
        @mouseleave="uid = null"
      >
        <!-- <el-link :href="`${baseUrl}${file.url}`" :underline="false" target="_blank"> -->
        <!-- <span class="el-icon-document"> {{ file.name||getFileName(file.url) }} </span> -->
        <span class="el-icon-document"
          ><!-- 附件{{ index + 1 }}: -->
          {{ file.name }}</span
        >
        <!-- </el-link> -->
        <!-- <span>
          {{conver(file.size)}}
        </span> -->
        <div
          class="ele-upload-list__item-content-action"
          v-if="file.status == 'success' && uid != file.uid"
        >
          <el-link :underline="false" type="success">上传成功 </el-link>
        </div>
        <div
          class="ele-upload-list__item-content-action"
          v-else-if="file.status == 'ready' && uid != file.uid"
        >
          <el-link :underline="false" type="primary">准备上传 </el-link>
        </div>
        <div
          class="ele-upload-list__item-content-action"
          v-else-if="uid == file.uid"
        >
          <el-link
            :underline="false"
            @click="handleDelete(file, index)"
            type="danger"
            v-if="disable"
            >删除
          </el-link>
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";

export default {
  name: "FileUpload",
  props: {
    //判断是否显示 上传 删除
    disable: {
      default: true,
    },
    // 值
    value: [String, Object, Array],
    // 数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["doc", "xls", "ppt", "txt", "pdf"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],

      baseUrl: process.env.VUE_APP_BASE_API,
      uploadFileUrl: process.env.VUE_APP_BASE_API + "/system/sample/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
      uid: null,
    };
  },
  watch: {
    value: {
      handler(val) {
        console.log("val  fileList: ", val);
        if (val) {
          let temp = 1;
          // 首先将值转为数组
          const list = Array.isArray(val)
            ? val.filter((item) => item.type == 2)
            : this.value.split(",");
          // 然后将数组转为对象数组

          this.fileList = list.map((item) => {
            console.log("item: ", item);
            if (item.imgId) {
              item.status = "success";
              item.name = this.getFileName(item.url);
            }
            if (typeof item === "string") {
              item = { name: item, url: item };
            }
            item.uid = item.uid || new Date().getTime() + temp++;
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    submitUpload() {
      this.$refs.fileUpload.submit();
    },
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      console.log("file: ", file);
      // 校检文件类型
      if (this.fileType) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        const isTypeOk = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
        if (!isTypeOk) {
          // this.$message.error(
          //   `文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`
          // );
          this.msgError(
            `文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`
          );

          return false;
        }
      }
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          // this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`);
          this.msgError(`上传文件大小不能超过 ${this.fileSize} MB!`);

          return false;
        }
      }
      this.number++;
      console.log("this.number: ", this.number);
      return true;
    },
    handleChange(file, fileList) {
      this.fileList = fileList;
      console.log("file, fileList: ", file, fileList);
    },
    // 文件个数超出
    handleExceed() {
      // this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`);

      this.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError(err) {
      // this.$message.error("上传失败, 请重试");
      this.msgError("上传失败, 请重试");
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      console.log("res, file: handleUploadSuccess", res, file);
      // this.$message.success("上传成功");
      if (res.code !== 200) {
        // 接口直接报错，没有拦截到。所以num不能--
        console.log("接口直接报错，没有拦截到。所以num不能--: ");

        this.number--;
        console.log("this.number: erro", this.number);
        this.$refs.fileUpload.handleRemove(file);
        this.uploadedSuccessfully();
        this.msgError(file.name + "上传失败, 请移除文件后重新上传");
        return;
      } else {
        this.uploadList.push({
          url: res.url,
          type: 2,
          name: file.name,
        });
        this.uploadedSuccessfully();
      }

      // this.fileList.push({ name: file.name, url: res.url });
      // this.$emit("input", this.listToString(this.fileList));

      // if (this.uploadList.length === this.number) {
      //   // this.fileList = this.uploadList;
      //   this.$emit("input", JSON.stringify(this.uploadList));
      //   // this.uploadList = [];
      //   // this.number = 0;
      // }
    },
    // 上传结束处理
    uploadedSuccessfully() {
      console.log(
        "this.number > 0 && this.uploadList.length === this.number: ",
        this.number > 0,
        this.uploadList.length,
        this.number
      );
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        // this.uploadList = [];
        this.number = 0;
        this.$emit(
          "input",
          this.listToString(this.fileList.filter((item) => item.type == 2))
        );
        this.uploadList = [];
      }
    },
    // 删除文件
    handleDelete(file, index) {
      console.log("file,index: ", file, index);

      this.fileList.splice(index, 1);
      this.$emit("input", this.listToString(this.fileList));
    },
    // 获取文件名称
    getFileName(name) {
      console.log("name: ", name);
      if (name && name.lastIndexOf("/") > -1) {
        return name.slice(name.lastIndexOf("/") + 1).toLowerCase();
      } else {
        return "";
      }
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      console.log("list, separator: ", list, separator);
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].name + separator;
      }
      console.log("strs: ", strs.substr(0, strs.length - 1));
      // return strs != "" ? strs.substr(0, strs.length - 1) : "";
      return list;
    },
  },
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  height: 30px;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>
